Technological method for preventing oxide skins in ultra-supercritical boiler from appearing and falling
A technology of ultra-supercritical boilers and process methods, which is applied to the components of steam boilers, the indication of boiler working conditions, steam boilers, etc., can solve the problems of manpower and resource loss, and achieve the effect of avoiding local overheating
Active Publication Date: 2015-01-14
JIANGSU DATANG INT LUSIGANG POWER GENERATION
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[0036] based on the following Figure 1 ~ Figure 3 A preferred embodiment of the present invention will be described.
[0037] In this example, a 4×660MW ultra-supercritical unit is used, and the boiler model is HG-2000 / 26.15-YM3 (ultra-supercritical pressure once-through boiler), which adopts a П-shaped layout, a single furnace, and an improved low NOX PM (Pollution Minimum pollution) Main burner and MACT (Mitsuibishi Advanced Combustion Technology) type low NOx staged air supply combustion system, wall type tangential circle, furnace adopts inner threaded pipe vertical water wall, starting system with recirculation pump, one intermediate reheating .
[0038] The present invention provides a kind of technological method that prevents scale from being produced and come off in ultra-supercritical boiler, and this technological method comprises the following steps:
[0039] Step 1. Add wall temperature measuring points on the high temperature heating surface of the boiler.
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A technological method for preventing oxide skins in an ultra-supercritical boiler from appearing and falling includes the steps that firstly, wall temperature measuring points are additionally arranged on a high-temperature heated face of the boiler, then, a spraying nozzle of A-A air swings in the horizontal direction and the perpendicular direction by arranging an A-A air bellow so that the residual rotation of airflow in a hearth can be weakened and the deviation between the smoke temperatures of the two sides of an outlet of the hearth can be reduced, and the thermal deviation of the heated face of the boiler is further adjusted by optimizing the boiler dust blowing mode, the boiler start-up and shut-down running mode and the boiler water supplying and oxygen supplying running mode. According to the technological method for preventing the oxide skins in the ultra-supercritical boiler from appearing and falling, under the condition that the efficiency of the boiler is not changed, the pipe wall temperature of the heated face of the boiler and the temperature change speed are effectively controlled, the partial overtemperature is avoided, and the problem that the oxide skins fall on a large scale is solved.
Description
technical field [0001] The invention relates to a process method for preventing the generation and shedding of scale in an ultra-supercritical boiler. Background technique [0002] During the operation of ultra-supercritical boilers, scale peeling is prone to occur according to the temperature field distribution of the boiler and the use of pipes on the heating surface. [0003] At present, the main materials of the high-temperature heating surface are SA-213TP347H and A-213S30432, and only a small amount of SA-213TP310HCbN. TP347H pipes are operated at high temperature. Due to poor oxidation resistance, the oxide scale is formed rapidly. When the unit is shut down, the oxide scale is seriously (completely) peeled off; the oxidation resistance of SUP304 pipe is stronger than that of TP347H, and the oxide scale is partially peeled off; It has the best anti-oxidation performance and no scale peeling off. [0004] The metal temperature on the inner wall of the boiler heating ...
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IPC IPC(8): F22B37/02F22B37/38
Inventor 蒋跃军刘效东高向阳祁永峰杨俊祥陈雪峰孙建军秦毅藤利辉王力强刘进峰蒙殿武王鑫
Owner JIANGSU DATANG INT LUSIGANG POWER GENERATION